Home / Community & Support / Developer Productivity Tools Forums / WPF > Expander > Expand Collapse containing window

• Xaria D

  Posted on Aug 10, 2010 (permalink)

  I have a Rad Expander inside a RadPane.
  I wish to expand or resize the width of the pane when the expander is expanded and likewise, reduce the width when expander is collapsed.
  How to get the desired behavior?

  Reply

• Xaria D

  Posted on Aug 10, 2010 (permalink)

  Bump.

  Reply

• Miroslav Miroslav

  Posted on Aug 13, 2010 (permalink)

  Hi Xaria D,
  
  Is it a floating / undocked pane?
  
  Then you can use this code:
  
  

  static MainWindow()

  {

      EventManager.RegisterClassHandler(typeof(RadPane), 

          RadExpander.CollapsedEvent, new RoutedEventHandler(OnExpanderToggled));

      EventManager.RegisterClassHandler(typeof(RadPane), 

          RadExpander.ExpandedEvent, new RoutedEventHandler(OnExpanderToggled));

  }

    

  private static void OnExpanderToggled(object sender, RoutedEventArgs e)

  {

      var pane = sender as RadPane;

      var window = pane.GetVisualParent<ToolWindow>();

    

      if (window != null

          && (pane.IsFloating || pane.IsFloatingOnly))

      {

          window.ClearValue(Control.HeightProperty);

      }

  }

  
  Whenever an expander in the content is toggled, the height would size to the desired size of the content.
  
  Regards,
  Miroslav
  the Telerik team

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